2.3.0

• Migrated to AndroidX and latest dependencies.
• When launching an activity and using the "silent" crash mode for background crashes, the library detected the app as in background and crashed silently. A new mechanism has been introduced: if a crash occurs less than 500 ms after an activity has been created, the app is considered in foreground and the error activity is shown instead of crashing silently. Closes #44.
• A more trustworthy method of detecting possible restart loops has been implemented (if a crash somehow occurs in the error activity process, the library does not intercept it).
• Added a null check to getConfigFromIntent. Closes #56.
• Added OS version to the error details. Closes #57.