Update & refactor tools/debugger

- Polish dap-mode support
- Fix realgud autoloads
- Add +debugger/start and +debugger/quit
- Move dap-breakpoints file into doom-etc-dir
- Fix SPC o d
- Add popup rule for realgud:pdb debugger
- Update display-in-popup advice to reflect changes upstream
- Realgud command buffer is auto-killed (and popup closed) when quitting
  the debugger.
- (evil users) Add :debug ex command

modules/editor/evil/+commands.el

@@ -177,7 +177,7 @@ If BANG, search Doom documentation."
 ;;; Project tools
 (evil-ex-define-cmd "compile"     #'+evil:compile)
 (evil-ex-define-cmd "mak[e]"      #'+evil:make)
-;; (evil-ex-define-cmd "debug"       #'+debug/run)
+(evil-ex-define-cmd "debug"       #'+debugger/start)
 (evil-ex-define-cmd "er[rors]"    #'flycheck-list-errors)
 
 ;;; File operations