Add commands to set and unset ISE Compatibility features (#2335)

* Add commands to set and unset ISE Compatibility features

* Rename to Enable/Disable ISE Mode.
Some formatting changes due to vscode format document.
Remove option to hide PSIC
Check that user hasn't modified settings from ISE settings before returning them to default.

* use async await

* Update Variable Names.
Add interface for settings.

* Change foreach to for.

* Allow testing on Linux.
Caveat: This is sometimes inconsistent if there were compile errors. Sometimes need to run Invoke-Build Clean before Invoke-Build Test will pick up code changes.

* Add some tests.

* change registerCommand to fix tests

* line length

* move to static

* skip tests on linux

* additional checks

* move to new lib to update timeout

* color check

* launch args

* revert change that shouldn't have been in

* try to run on linux again

* change changelog and no ci on linux

* command explorer

Author: corbob

CHANGELOG.md

@@ -4,12 +4,14 @@
 ### Wednesday, December 11, 2019
 #### [vscode-PowerShell](https://github.com/PowerShell/vscode-PowerShell)
 
+- ✨ 📺 [vscode-PowerShell #2335](https://github.com/PowerShell/vscode-powershell/pull/2335) -
+  Add editor command `PowerShell: Enable/Disable ISE Mode` for ISE emulation in VS Code.
 - ⚡️ 🛫 [vscode-PowerShell #2348](https://github.com/PowerShell/vscode-PowerShell/pull/2348) -
   Start EditorServices without start script.
 - ✨ 📟 [vscode-PowerShell #2316](https://github.com/PowerShell/vscode-PowerShell/pull/2316) -
-  Handle clearTerminal message by using vscode clear command.
+  Add `powershell.integratedConsole.forceClearScrollbackBuffer` setting to enable `Clear-Host` to clear scrollback buffer.
 - 🐛 📺 [vscode-PowerShell #2325](https://github.com/PowerShell/vscode-PowerShell/pull/2325) -
-  Fix update powershell feature on windows.
+  Fix update PowerShell feature on windows.
 - 🔧 📁 🐛 [vscode-powershell #2099](https://github.com/PowerShell/vscode-PowerShell/pull/2304) -
   Use `powerShellDefaultVersion` everywhere and stop using `powerShellExePath`.
 - 🐛 📺 [vscode-PowerShell #2294](https://github.com/PowerShell/vscode-PowerShell/pull/2294) -
@@ -22,11 +24,11 @@
 - 🛫 🐛 ⚡️ [vscode-powershell #2292](https://github.com/PowerShell/PowerShellEditorServices/pull/1118) -
   Isolate PSES dependencies from PowerShell on load + make PSES a pure binary module.
 - ✨ 📟 [PowerShellEditorServices #1108](https://github.com/PowerShell/PowerShellEditorServices/pull/1108) -
-  Clear the terminal via the LSP.
+  Clear the terminal via the LSP message `editor/clearTerminal`.
 - 🔍 🐛 [vscode-powershell #2319](https://github.com/PowerShell/PowerShellEditorServices/pull/1117) -
   Run one invocation per SetBreakpoints request. (Thanks @SeeminglyScience!)
 - 🐛 [PowerShellEditorServices #1114](https://github.com/PowerShell/PowerShellEditorServices/pull/1114) -
-  Fix Import-EditorCommand -Module. (Thanks @sk82jack!)
+  Fix `Import-EditorCommand -Module`. (Thanks @sk82jack!)
 - 🐛 🔍 [PowerShellEditorServices #1112](https://github.com/PowerShell/PowerShellEditorServices/pull/1112) -
   Fix breakpoint setting deadlock.
 - 🔗 🐛 [vscode-powershell #2306](https://github.com/PowerShell/PowerShellEditorServices/pull/1110) -
@@ -40,7 +42,7 @@
 - 👮‍ 🐛 [vscode-powershell #2288](https://github.com/PowerShell/PowerShellEditorServices/pull/1094) -
   Use RootUri.LocalPath for workspace path.
 - 🐛 👮‍ [PowerShellEditorServices #1101](https://github.com/PowerShell/PowerShellEditorServices/pull/1101) -
-  Add PSAvoidAssignmentToAutomaticVariable to the default set of PSSA rules. (Thanks @bergmeister!)
+  Add `PSAvoidAssignmentToAutomaticVariable` to the default set of PSSA rules. (Thanks @bergmeister!)
 - 👮‍ 🔗 🐛 [vscode-powershell #2290](https://github.com/PowerShell/PowerShellEditorServices/pull/1098) -
   Fix diagnostics not showing in untitled files and now also show CodeLens.
 - 🔍 🐛 [vscode-powershell #1850](https://github.com/PowerShell/PowerShellEditorServices/pull/1097) -