PowerShell 6 Core Support (#35)

## About
This pull request reflects all changes done in the `linuxsupport` branch.

## Content
- Enable PowerShell 6 Core support
- Use PFX Certificate for encryption ( fixes #32 )
- Updates CI / CD pipeline ( fixes #31 )
- uses portable libressl ( fixes #34 )
- adds `-PassThru` switch for returning current `VIServer` session in `Connect-To` ( fixes #34 )
- adds git lfs for embedded libressl files
- restructured internal functions into `Private` dir
- added certificate related functions
- adds travis build pipeline for tests

docs/Get-CredentialStore.md

@@ -63,7 +63,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/Get-CredentialStoreItem.md

@@ -19,7 +19,7 @@ Get-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [<CommonPara
 
 ### Shared
 ```
-Get-CredentialStoreItem [-Path <String>] -RemoteHost <String> [-Identifier <String>] [-Shared]
+Get-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Shared] [-Path <String>]
  [<CommonParameters>]
 ```
 
@@ -93,7 +93,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/New-CredentialStore.md

@@ -19,7 +19,7 @@ Get-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [<CommonPara
 
 ### Shared
 ```
-Get-CredentialStoreItem [-Path <String>] -RemoteHost <String> [-Identifier <String>] [-Shared]
+Get-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Shared] [-Path <String>]
  [<CommonParameters>]
 ```
 
@@ -93,7 +93,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/New-CredentialStoreItem.md

@@ -20,8 +20,8 @@ New-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Credential
 
 ### Shared
 ```
-New-CredentialStoreItem [-Path <String>] -RemoteHost <String> [-Identifier <String>]
- [-Credential <PSCredential>] [-Shared] [<CommonParameters>]
+New-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Credential <PSCredential>] [-Shared]
+ [-Path <String>] [<CommonParameters>]
 ```
 
 ## DESCRIPTION
@@ -51,7 +51,7 @@ Aliases:
 Required: False
 Position: Named
 Default value: None
-Accept pipeline input: False
+Accept pipeline input: True (ByValue)
 Accept wildcard characters: False
 ```
 
@@ -111,7 +111,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/Remove-CredentialStoreItem.md

@@ -19,7 +19,7 @@ Remove-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [<CommonP
 
 ### Shared
 ```
-Remove-CredentialStoreItem [-Path <String>] -RemoteHost <String> [-Identifier <String>] [-Shared]
+Remove-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Shared] [-Path <String>]
  [<CommonParameters>]
 ```
 
@@ -94,7 +94,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/Set-CredentialStoreItem.md

@@ -14,13 +14,14 @@ Changes the credentials for the given remote host in the store.
 
 ### Private (Default)
 ```
-Set-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [<CommonParameters>]
+Set-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Credential <PSCredential>]
+ [<CommonParameters>]
 ```
 
 ### Shared
 ```
-Set-CredentialStoreItem [-Path <String>] -RemoteHost <String> [-Identifier <String>] [-Shared]
- [<CommonParameters>]
+Set-CredentialStoreItem -RemoteHost <String> [-Identifier <String>] [-Credential <PSCredential>] [-Shared]
+ [-Path <String>] [<CommonParameters>]
 ```
 
 ## DESCRIPTION
@@ -37,6 +38,21 @@ Set-CredentialStoreItem -Path "C:\TMP\mystore.json" -RemoteHost "esx01.myside.lo
 
 ## PARAMETERS
 
+### -Credential
+{{Fill Credential Description}}
+
+```yaml
+Type: PSCredential
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: True (ByValue)
+Accept wildcard characters: False
+```
+
 ### -Identifier
 Defaults to "".
 Specify a string, which separates two CredentialStoreItems for the
@@ -94,7 +110,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False

docs/Test-CredentialStore.md

@@ -63,7 +63,7 @@ Type: SwitchParameter
 Parameter Sets: Shared
 Aliases:
 
-Required: False
+Required: True
 Position: Named
 Default value: False
 Accept pipeline input: False