This replaces single quotes for double quotes in the configuration
comments that refer to strings.
This was misleading since someone could took that comment as a valid
config entry, which is not. One notable example was `backend = 'glx'`
which is not accepted by libconfig.
This also adds `;` for each default config values for consistency.
**Work-in-Progress**
Add `dual_kawase` to configuration and argument parsing. Allow `kawase`
for backward compatibility. Add `--blur-strength` parameter for
blur-method `dual_kawase`.
Update documentation to reflect the new blur-method and parameters.
leftovers:
1) config file path. Has to implement compatibility functionalities before
we can change it.
2) links in man pages. Has to migrate the repo first.
3) _COMPTON_SHADOW, it has become a defacto standard, so we have to keep
supporting it.
4) dbus names, undecided whether we should/could change it.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
