~thrrgilag/pantalaimon-ut

add build requirements
Update pantalaimon to 0.9.2
full cross compile using clickable
add olm submodule
pin python cryptography to 3.2.1

This is the last version of python cryptography that will cleanly
build on Ubuntu Touch 16.04. The 3.3 series depends on newer openssl and
the 3.4 series depends on Rust.
fix loglevel setting on save

selectedIndex doesn't actually change until after onDelegateClicked
completes, which results in the previous value being saved rather
than the desired one. This correctly handles the change in setting.
add gloabl setting for loglevel
added default section to config load and save
fix proxy and ssl default
add additional settings
update pantalaimon to 0.7.0
add project links to README
set valid url for homeserver

fixes https://todo.sr.ht/~thrrgilag/pantalaimon-ut/3
create config path if it doesn't exist before save

resovles https://todo.sr.ht/~thrrgilag/pantalaimon-ut/2
updated build instructions and fixed spelling
remove unused imports
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