Add support for specifying oblivionMods via CLI

This is a quick untested hack that enables setting the WB root
directory (oblivionMods) through a command line argument: --bash-root
(short version -R, for ... root, idk).

Motivation is reducing reliance on bash.ini, allowing configuration to
be set at init time or through settings dict.

Mopy/bash/barg.py

@@ -45,7 +45,9 @@ def arg(group, dashed, descr, dest, action='store', dflt=None):
          'Use this argument if Wrye Bash is located outside of the game '
          'directory, and automatic detection failed to find it.')
     arg(pathGroup, '-o', '--oblivionPath', dest='oblivionPath')
-
+    # oblivionMods #
+    h = ('Specify the root directory for Wrye Bash managed files.')
+    arg(pathGroup, '-R', '--bash-root', dest='oblivionMods')
     ### User Path Group ###
     userPathGroup = parser.add_argument_group('User Directory Arguments',
         'These arguments allow you to specify your user directories in '
@@ -144,6 +146,7 @@ def arg(group, dashed, descr, dest, action='store', dflt=None):
     '-q': '--quiet-quit',
     '-r': '--restore',
     '-u': '--userPath',
+    '-R': '--bash-root',
 }
 
 def convert_to_long_options(sys_argv):

Mopy/bash/bash.py

@@ -596,7 +596,7 @@ def _detect_game(opts, backup_bash_ini):
     #--They depend on setting the bash.ini and the game
     from . import initialization
     game_ini_path, init_warnings = initialization.init_dirs(
-        opts.personalPath, opts.localAppDataPath, bush_game)
+        opts.personalPath, opts.localAppDataPath, bush_game, bash_root=opts.oblivionMods)
     if init_warnings:
         warning_msg = _('The following (non-critical) warnings were found '
                         'during initialization:')

Mopy/bash/initialization.py

@@ -104,7 +104,7 @@ def _get_ini_path(ini_key, dir_key, *args):
         src = 'Relative Path'
     return idata_path, src
 
-def init_dirs(personal, localAppData, game_info):
+def init_dirs(personal, localAppData, game_info, bash_root=''):
     """Initialize bass.dirs dictionary. We need the bash.ini and the game
     being set, so this is called upon setting the game. Global structures
     that need info on Bash / Game dirs should be initialized here and set
@@ -218,7 +218,8 @@ def init_dirs(personal, localAppData, game_info):
     dirs[u'tag_files'] = dirs[u'mods'].join(u'BashTags')
     dirs[u'ini_tweaks'] = dirs[u'mods'].join(u'INI Tweaks')
     #--Mod Data, Installers
-    oblivionMods, oblivionModsSrc = getOblivionModsPath(game_info)
+    oblivionMods = _get_cli_ini_path(bash_root, '-R', 'oblivionMods', game_info, getOblivionModsPath, "failed setting root","Specified bash root directory does not exist")
+    # oblivionMods, oblivionModsSrc = getOblivionModsPath(game_info)
     dirs[u'bash_root'] = oblivionMods
     deprint(f'Game Mods location set to {oblivionMods}')
     dirs['modsBash'], modsBashSrc = _get_ini_path('BashModData', 'bash_root',