Fake vim

See merge request !19

UI & MISC: Place the 'using' on FakeVim internal types inside the proxy editor to not poluate the Vivy namespace

UI: The ScriptDocumentView has the same background as the ScriptEditor to avoid ugly not colored squares

Add a way to execute a Lua file with Vivy in a click-click way

See merge request !16

SCRIPT: Get ride of the unregister functions in the LuaContext because everything will be wiped out when closing the lua_State

Only local functions and jobs are registered, the other will be
registered with their parent script.

SCRIPT: Principal file is the module file, when the module is loaded, load the associated implementation file

SCRIPT: Be explicit about methods to get last Lua error + only load the module file, the implementation file will be loaded after (because implementation file is setted in the module file)

- IterateOverArray: The lua_gettable was popping the index from the
  table, thus multiple pops will pop the table (BUG!)
- Add macro for the return nothing
- Fix the user values, set all user values, not just one that will
  replace all the old ones