navbar: show menu if nav bars are force enabled via property

users can force enable navigation bars, via setting the
property "qemu.hw.mainkeys=0".
after a reboot, they have fully functional navigation bars.

unfortunatly the omnigears setting doesnt recognize them, as it
doesnt check for it.

lets check for this property and let users, which force enable
their navigation bar, enjoy the option to customize them.

Change-Id: I2b8b4a74d50f2d13ff15840845e64f7cf42f7d87
OmniGears: volume key music control

Requires https://gerrit.omnirom.org/#/c/3860/

Change-Id: I8d0b1007d64c16d1fd96d3f8086396afc57d25a2
Fix the Italian translation+update new strings

Change-Id: Ic5ce8cb7e9fa043b6c572ea5a40706db9ed157a9
Merge "Fix the Italian translation+update new strings" into android-4.4
fix new It Strings

Change-Id: If3246c2abac6a6a51cc143052b2891070584a591
Merge "navbar: show menu if nav bars are force enabled via property" into android-4.4
OmniGears: CS Translations

Change-Id: Ibdd25b30841aa8c73233bf8577951e974e6dcff5
[2/2] OmniGears: Quick pulldown

This adds an option to toggle between left, right & centre.
left is the 30% from left, right is 30% from right &
centre is 40% in the middle.

Change-Id: Idbbc44c7809ab0b08f38be82b9002a1d48eb6e32
Merge "fix new It Strings" into android-4.4
Merge "[2/2] OmniGears: Quick pulldown" into android-4.4
[2/3]OmniGears: Add keyboard features

this commit adds:
- ime switcher notification - thanks cm
- slims fullscreen disable on landscape
- slims force autorotation on IME
- volume button control for navigate in the message - thanks cm
- slims force to show always enter key

some fixes to the 4.2/4.3 implementations + added full multiuser
support for all these features.

Base: https://gerrit.omnirom.org/#/c/4370/
Settings: https://gerrit.omnirom.org/#/c/4372/

Change-Id: If4e2ae97175c9f81ecfc1c9896ed1ab27448d558
Merge remote-tracking branch 'omni/android-4.4' into 4.4