Generic, webdriver, and android updates and fixes

[ferpasri]

Generic:

• Add state feedback tag
• Add log, screenshots, and test serialiser null guards

Webdriver:

• Calculate WdElement visibleAt logic with scrollTop
• Improve web ensureCanvasOnTop logic

Android:

• Extend AndroidLogcatOracle to normalize file paths and object IDs
• Update android actions toString description, which constitutes the action's concrete ID. This also fixes an issue with HTML report action screenshots
• Delete unused AndroidActionPinch
• Catch potential android driver initialization issue to avoid breaking TESTAR execution