[ ] prepare to fix 09_26_2
[-] removed useless TODOs
[+] initial commit for documentation (ru)
[+] added activity for vpn payload details
[+] added fragment for vpn payload details
[+] added constants for tabs
Merge branch 'fix_crash_on_ctx_destroy' into fix_09_26_5

* fix_crash_on_ctx_destroy:
  [*] fix crash on the destroying usernat (do not close socket after closing it's input and output streams)
  [-] remove annoying log message
  [+] added traceprints for the calls in corresponding files
  [+] added debug flags for tun, router epoll and trace [+] added field with reference generation
  [+] added utils
  [~] make only x86 and armeabiv7a
Merge branch 'develop-demitsuri' into fix_09_26_2
[+] aded a rediect to VpnPayload activity
[+] added new field to payload info data handlers
[+] added new field support to loader and installer task
Merge branch 'fix_missing_payload_display_name_db_field' into fix_09_26_2
[+] tab name for openvpn settings
[ ] abstract models moved to another package
[ ] corresponding changes in imports
[+] method for setting text by resource id
[+] we can set texts by resource ids in ListItemModel
[~] Vpn switch model extracted from main activity
[-] removed unused imports
[*] fix a bug when text is null and text resource id is 0 at the same time
[~] vpn status model was extracted from the main activity
[~] extract ListItemMapper into separate class
[+] models for on demand switch & vpn data list