debt - no guessing-caching, better use of gc-signals, command converter using gc-signals, main side heap service

related to #13415

* added missing case for isValidBranchName . at end of name

* added correctBranchName function
this function will convert any invalid charcters from the branch name to -

* git quickopen to correct invalid branch names
instead of not showing any branches when trying to create a new branch

* revert to normal regex instead of groups

* do not correct empty branch names

* correct invalid input name for BranchCommand

* correct invalid input name for BranchCommand

* revert misscomitted settings.json change

* hygeine formatting

Merge branch 'fix_1939' of https://github.com/Krzysztof-Cieslak/vscode into Krzysztof-Cieslak-fix_1939

update to electron 1.3.8

fixes #14139

Update handlebars block comments symbols

quick open files in background

- allows one to continually open files while keeping quick open widget focused
- uses the right modifier key to open in background
- can open in split view if using the cmd trigger key