Log Message:
Update uim to 1.6.0.
Based on PR#43872 by YAMASHIRO, Jun.
some fixes and improvements by me.

uim Changelog:
  - New IM uim-social-ime
  - New IM uim-ajax-ime
  - New IM uim-yahoo-jp
  - Support Wubi86 and ZhengMa tables with Generic IM
  - Improved uim-tutcode with many nice features with table style
    candidate window
  - Stable Qt4 bridge
  - Annotation system
  - Internal plugin system reorganization
  - uim-elatin enhancement
  - Japanese multiple-segment IM enhancement