Bump version to 1.7.0

Set version to 1.7.0-rc1

Changelog for 1.6.1 (fraunhoferhhi#199)

Merge pull request fraunhoferhhi#193 from jbrdbg/develop_1.6.0_final

Version 1.6.0 final

15%+ speedup, RC improvements for high rates, various changes towards…

… 1.6.0 (fraunhoferhhi#185)

Change version to 1.5.0

New presets (10%+ speedup for faster..medium, 6% for slow(er)), Chang…

…elog, LowDelay->PicReordering (fraunhoferhhi#178)

Changes for 1.4.0 final (fraunhoferhhi#149)

* applying remaining changes

* version bump

v1.4.0-rc1: Clear BSD, fixes and improvements! (fraunhoferhhi#146)

* Preparing v1.4.0-rc1

* fixed line endings in the new copyright license

Update version to 1.3.1