cleanup duplicate semicolons in minimapCharRenderer

This includes fixes for the following:

* C# 7 ref locals and ref returns (https://github.com/dotnet/csharp-tmLanguage/issues/12)
* C# 7 throw expressions (https://github.com/dotnet/csharp-tmLanguage/issues/69)

fix some typos

fixes #28014

fixes #27856

fixes #27979

Add `.rhtml` to html extension

fixes #27389

itroduced in https://github.com/Microsoft/vscode/commit/8f9dc8e220aef53c19ef9dfa7284689e04080a0d#diff-0e25f213bdb14a7f0c59d148e40f02f5R256 and https://github.com/Microsoft/vscode/commit/8faa03f88573dbf4b0f5a5a6b583436319d836a8#diff-0e25f213bdb14a7f0c59d148e40f02f5R256

fix casing

Turn autocomplete off on Mobile device keyboards