[Ohrrpgce] SVN: teeemcee/13070 get_support_dir and find_helper_app improvements & fixes

[subversion at HamsterRepublic.com]

teeemcee
2022-08-19 21:09:13 -0700 (Fri, 19 Aug 2022)
557
get_support_dir and find_helper_app improvements & fixes

get_support_dir:
-look in app_dir rather than exepath, as appropriate
-checks for existence of settings_dir&"/support" before trying to create app_dir&"/support".
-make creating the directory optional

find_helper_app:
-calls get_support_dir instead of inaccurately duplicating its logic. find_helper_app
 never looked in ~/.ohrrpgce/support
-On Unix, looks in support/ before trying 'which', for consistency with find_windows_helper_app.

Also add missing error message when rcedit.exe was missing.
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U   wip/common.bi
U   wip/common.rbas
U   wip/distribmenu.bas