BottomSheet bugfixes (crash, animation)

[MFlisar]

Feel free to only merge the bottom sheet changes and the dismiss change.

This does fix following issue:
https://github.com/afollestad/material-dialogs/issues/2076

Changes

• Updated MaterialDialog dismiss function to make sure it's only called if the activity is not being finished (only if it is attached to an activity and only on android API >= 17)
• Updated BottomSheet to allow to enable/disable animation and to allow to define an initial state (half expanded, full expanded)
  => animation must be disabled inside a DialogFragment because this fragment will call onShow after screen rotation and also after screen off/on => this leads to collapsed sheets sometimes and to repeated animations on every screen on/off
  => if animation is disabled, everything works perfectly fine inside a DialogFragment as well now

Additionally I would have also done following:

• updated gradle to 7.2
• made the project jitpack compatible again after update to gradle 7 (forks can be retrieved easily via jitpack now)
• made the project compatible to include it as local fork
  • added a "namespace" to all modules (prefix md)
  • made gradle definitions relative to project instead of root project

TODO after merge (seems like you do not merge anything anymore, but still here are the steps to undo my "special" changes)

• Change the maven config back to yours:
  https://github.com/MFlisar/material-dialogs/blob/b8f8203513466b1c30dc8046ef5e61a3e61495b5/gradle/android_library_config.gradle#L6-L9
• Enable spotless again (I don't use spotless and so I disabled this plugin, it does not work out of the box in a local fork the way its set up in your repo)
  https://github.com/MFlisar/material-dialogs/blob/b8f8203513466b1c30dc8046ef5e61a3e61495b5/gradle/android_common_config.gradle#L6

Note

If someone else wants to use it already, it's already published on jitpack and can be used like following:

implementation "com.github.MFlisar.material-dialogs:core:3.3.0-1"
....