add libffi-dev dependency in debian-based instruction

fixes #129

fix error message due to disabling updater sites in sidebar

it's now a standard dependency

these are required e.g. on Tails, although I still couldn't get
0net to work on it yet

Signed-off-by: caryoscelus <[email protected]>

Add more deb-based dependencies

remove pyaes from src/lib

skip redundant check

reduce fingerprinting of site owner

fixes #138

prepare for v0.7.7

refs #109

ask for optional mute reason

minor code improvements

refs #138

fix regression introduced in 8913363
fixes #142

fixes #142

NoNewSites plugin

a small plugin that disables adding new sites (similar to multi user plugin setting), good as a source of sample plugin code

show help if exception is thrown early in startup

there's still a bug that doesn't update unfavouriting in real time

favourite/unfavourite in the sidebar

refs #146

- using underscore is deprecated but still works
- also don't override commandline --open-browser option

refs #252

Use dashes in command line options instead of underscore

Fix py3.9 compatibility

Fetch version info from git or Build file

Fix command-line argument style (use dashes instead of underscores)

fixes #257

..As long as CORS read permission is granted. This is done for
compatibility with sites that relied on lack of enforcing of cross-site
isolation in previous ZeroNet versions.

fixes #259

Simplified cors 2

gitignore enabled plugins that disabled by default #265

#269

- Content-Security-Policy: `frame-src *` for main UiRequest and `self` for
  user-content UiRequest
- revert change in getHostWithoutPort to make ipv6 work

…it makes sense (i.e. on localhost) by default

refs #263, #270

- fix non-local --ui-ip usage (--ui-ip-protect option)
- fix ipv6 handling
- fixes #263 (IPv6 validation)