Renamed ismounting, setmounting, @mount2

To avoid ambiguity:
- The script command ismounting is now hascashmount
- The script command setmounting is now setcashmount
- The at-command @mount2 is now @cashmount

Signed-off-by: Haru <haru@dotalux.com>
Re-commit of 4ac673941714032ada6d26fb60936ec510bbe496 (part 3)

    Some Quality of Life Changes

- setdragon, setmadogear and setriding deprecated; use setmount instead.
- checkdragon, checkmadogear, checkriding deprecated; use checkmount
  instead.

Signed-off-by: Haru <haru@dotalux.com>
Added support for script command deprecation (WIP)
Removed use of 'menu' from official (non-custom) scripts
Marked 'menu' script command as deprecated.

Note: Scripts in npc/custom haven't been updated to remove usage of
said script commands yet.

Signed-off-by: Haru <haru@dotalux.com>
Removed use of 'checkquest' from scripts (common folder)

Signed-off-by: Haru <haru@dotalux.com>
Removed use of 'checkquest' from scripts (pre-re folder)

Signed-off-by: Haru <haru@dotalux.com>
Removed use of 'checkquest' from scripts (re folder)

Signed-off-by: Haru <haru@dotalux.com>
Officially deprecated the 'checkquest' command.

Use questprogress instead.

Signed-off-by: Haru <haru@dotalux.com>