Undo failed attempt at asynchronous FormDef cache saving (getodk#2166)

Synchronously write to the cache from FormLoaderTask.createFormDefFromCacheOrXml, as before. 

The attempt at asynchronous FormDef cache saving initialized the form before caching it, possibly resulting in one instance’s data being loaded into other instances. Affected users should reset the form load cache in the Admin Settings.

Attempts to make the asynchronous approach work were abandoned because FormDefs are mutable.

Use system toast colors and ToastUtils class in all cases (getodk#2117)

Starting in Android 8.1, Toasts have black text on a white background by default. Using system defaults ensures a consistent experience across applications and fixes an issue where toasts in 8.1 were showing up as white on white.

Upgrade Javarosa to 2.9.0 (getodk#2090)

Merge pull request getodk#2069 from lognaturel/update-translations

Update March 2018 translations

Merge pull request getodk#2040 from lognaturel/jr-snapshot

Upgrade Javarosa

Update javarosa

Merge pull request getodk#1953 from lognaturel/collect-1952

Use auto-send attribute instead of auto-submit

Merge pull request getodk#1931 from lognaturel/update-translations

Update February translations.

Turn off debuggable builds for release (getodk#1898)

Check for null media path (getodk#1748)