Add Chinese translation
update Chinese
Bump version 1.0.93
Merge pull request #1077 from zm1990s/stable-1.1

add Chinese Translations.
DataFile: also update meta data when upgrading XML document
DataFile: write new header information only for song projects

No need to write these for presets etc.
Upgraded all presets

Rewrite all preset files with the current version so we can drop some
compat code in DataFile::upgrade() in the future.
Manually clean XML data in preset files

Removed old attributes which are not processed anymore.
DataFile: added nested LocaleHelper class

In order to address issues with differently coded floating points in
strings provide a helper class which can be instantiated when loading
or saving data.
Song, InstrumentTrack: use DataFile::LocaleHelper

Always save projects and presets with default C locale in order to avoid
problems in the future. At the same time properly load floating point
strings which have been saved with different locale settings.

Closes #1051.
InstrumentTrack: fixed whats-this text
Merge branch 'stable-1.1'
Skipped the chinese translation files because of merge conflict, those should be re-submitted for master

Conflicts:
	data/locale/zh.qm
	data/locale/zh.ts