historically, Libervia (SàT before) was using camelCase as allowed by PEP8 when using a
pre-PEP8 code, to use the same coding style as in Twisted.
However, snake_case is more readable and it's better to follow PEP8 best practices, so it
has been decided to move on full snake_case. Because Libervia has a huge codebase, this
ended with a ugly mix of camelCase and snake_case.
To fix that, this patch does a big refactoring by renaming every function and method
(including bridge) that are not coming from Twisted or Wokkel, to use fully snake_case.
This is a massive change, and may result in some bugs.
a new argument (`True` by default) fix orientation (i.e. rotate according to EXIF data) of
image when resizing it.
A new `fix_orientation` method (unused for now) let do it independently
/!\ new optional dependency: CairoSVG (with installed `[SVG]` extra)
- new `convert` method in `tools.image` to save an image in an other format, with support
for SVG (when CairoSVG is available)
- new `imageConvert` method is available for frontends
media type is guessed first from filename, then if it's not enough, the file is opened to
try to guess type. If it still can be determined, None is returned.
