configurable smp servers (#366, #411); core: profile images (#384)

* core: configurable smp servers (#366)

* core: update simplexmq hash

* core: update simplexmq hash (fix SMPServer json encoding)

* core: fix crashing on supplying duplicate SMP servers

* core: update simplexmq hash (remove SMPServer FromJSON)

* core: update simplexmq hash (merged master)

* core: profile images (#384)

* adding initial RFC

* adding migration SQL

* update RFC

* linting

* Apply suggestions from code review

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

* refine RFC

* add avatars db migration to Store.hs

* initial chages to have images in users/groups

* fix protocol tests

* update SQL & MobileTests

* minor bug fixes

* add missing comma

* fix query error

* refactor and update  functions

* bug fixes + testing

* update to parse base64 web format images

* fix parsing and use valid padded base64 encoded image

* fix typos

* respose to and suggestions from review

* fix: typo

* refactor: avatars -> profile_images

* fix: typo

* swap updateProfile parameters

* remove TODO

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

* ios, android: configurable smp servers (only model and api for android) (#392)

* android: configurable smp servers (ui)

* fix thumb color, fix text field color in dark mode

* update simplexmq hash (configurable servers in master)

Co-authored-by: IanRDavies <ian_davies_@hotmail.co.uk>
Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/Chat/Help.hs

@@ -86,10 +86,11 @@ chatHelpInfo =
       green "Create your address: " <> highlight "/address",
       "",
       green "Other commands:",
-      indent <> highlight "/help <topic>    " <> " - help on: files, groups, address",
+      indent <> highlight "/help <topic>    " <> " - help on: files, groups, address, smp_servers",
       indent <> highlight "/profile         " <> " - show / update user profile",
       indent <> highlight "/delete <contact>" <> " - delete contact and all messages with them",
       indent <> highlight "/contacts        " <> " - list contacts",
+      indent <> highlight "/smp_servers     " <> " - show / set custom SMP servers",
       indent <> highlight "/markdown        " <> " - supported markdown syntax",
       indent <> highlight "/version         " <> " - SimpleX Chat version",
       indent <> highlight "/quit            " <> " - quit chat",