[RELEASE] 4.5.0-beta.1

[jesmrec]

Open release

TASKS:

• [GIT] Create branch release/4.5.0-beta.1 in owncloud/android from master
• [DEV] Update version number and name in build.gradle in owncloudApp module
• [DEV] Check and reorder release notes in ReleaseNotesViewModel.kt to assure nothing important is missing there
• [DEV] Code review
• [DIS] Generate final bundle and APK from last commit in release branch
• [COM] Prepare post in central.owncloud.org (Category:News + Tag:android)
• [QA] Smoke tests
• [QA] QA approval
• [DIS] Upload release APK and bundle to internal ownCloud instance
• [DIS] Upload and publish release bundle and changelog in Play Store
• [GIT] Create and sign tag v4.5.0-beta.1 in HEAD commit of release branch, in owncloud/android
• [DIS] Publish a new release in owncloud/android
• [DIS] Release published in Play Store
• [COM] Publish post in central.owncloud.org (Category:News + Tag:android)
• [COM] Inform in #general that release is out
• [GIT] Merge master into release/4.5.0-beta.1, fixing all the conflicts that could happen, in owncloud/android
• [GIT] Merge without rebasing release/4.5.0-beta.1 branch into master, in owncloud/android