Fixed process attaching for GDB
Prevented the shell buffer in Windows.

I can't get it to work without PTY
Made (partial) Windows support official
Add the function vebugger#util#getToolFullPath
Merge branch 'add-framework-for-taking-path-from-global-variables' into add-mdbg-support
Add MDBG support(Windows only of course...)
Added Mdbg to the vimdoc and the readme
Make GDB, JDB, PDB and RDebug look at global variables for exeutable paths.

Mdbg already had this feature, since the Windows SDK doesn't normally
put it in the PATH(just like any other Microsoft tool that assumes you
are going to use Visual Studio and don't need the PATH...)
Merge branch 'release/1.1.0'