Add 'NoAutoCorrect' input mode to Droid Dialog EntryElement

(cherry picked from commit e2374bee0833c35b19a79469167db619694ae8d9)
Fix issues with unintended side effect for Droid Dialog FloatElement

(cherry picked from commit 5964d2f763f6e607730a54bd7105bc4f3f40ccb1)
MinValue/MaxValue changes - following up from https://github.com/slodge/MvvmCross/pull/344 to prevent unhandled exceptions during initial setup