Topic archiving, non-default permissions, bug fixes

Change list:

6ae30bc some tweaks hoping to fix Fatal Exception: java.lang.IllegalArgumentException radius must be > 0
7e55397 force redraw of message list
0b7a23e more natural navigation through backstack
583ba1a more try ... catch
225ba10 visual fixes
554c74f fix for crashes due to vector drawable on pre-lollipop
cedafc3 fix for a crash when me is null
c0996f5 (tag: v0.15.13-rc4) remove couple of warnings
cf4d8e2 logging cleaned up
f604aaf more work on enabling/disabling chats
988a9c1 support for confirming/ignoring/rejecting new chats
3910158 use version from BuildConfig
9a5f9a1 more consistency in editing topic params
aa686d8 also handle null init param in ACSHelper
22ae007 fix crash on undefined acs and simplify ACSHelper
769a57c (tag: v0.15.13-rc3) create users from p2p topics
7a25db8 check for nil value when merging, dont send recv on own messages
5f6d510 better handling of some errors, default ctrl.params
2eb5cb4 sync java sdk with the js sdk
0b62e93 generate different versions of the apk
5c82916 allow to send getMeta and setMeta without subscription
08d15bd make drafty form buttons look nicer
0d51e01 cleaning up warnings
fda4fe9 remove debug logging
cbed330 fix for empty contact list on cold start
26f5d68 add crashlytics
768057d (tag: v0.15.13-rc2) add error reporting to archiving and muting
3e36c48 handle menu clicks in chatlist
180da39 update action mode menu depending on the number of selected items
cb38e43 add chat archive fragment
60da35f adding archiving features
f740a19 (tag: v0.15.13-rc1) remove debug logging
9fc4a9b a lot of cleanup
ae3cf0a add type checks for topic.Private value
a08ab5d add topic arhiving to the sdk
40aeb2c fcm: read main db instead of contacts, fix for crash in VCard
2dd230e sort contact list by Topic.touched, code cleanup
4da93d3 fix bug in topic creation, code cleanup
a3a158a bug fix: crash when creating a group topic with members
eb71f11 bug fix: unable to change the password