Mobile application: update built-in scripts, not apk.

[johnd0e]

Currently IITC for desktop is updated automatically by GM/TM (well, after #32 resolved).

Mobile is also capable to update plugins, but only external.
So why do not update built-in scripts in the same manner?

In most cases it's enough to update scrips, and leave 'old' apk (well, there could be rare exceptions 0ae25e1).

[modos189]

In the Advanced menu there is a setting for updating. By default, updates are checked every week. I'm not sure if it works, but after #32 will need to check

[johnd0e]

I'm sure that it works as I use it. But: updates now are checked only for external scripts.

I suppose some changes required, as we need special place to store updated internal scripts.

[johnd0e]

Currently plugins list (incl. metainfo) is hardcoded in apk..

So here is the list what should be done (IMHO, as I am not good in reading Java sources):

• All scripts should be kept in some internal storage which does not demand storage permissions (like /sdcard/Android/data/org.exarhteam.iitc_mobile/assets/)
• On apk install this directory should be emptied and refilled from apk content.
• On iitc (re)load all the scripts should be (re)read (incl. metainfo).
• There should be configurable update check for internal scripts.
  I suppose it's easy part, as we already have external scripts check.
• We should also consider possibility to switch between update sources (like test/stable).