add gsearch_engine ag#4

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cpiger wants to merge 13 commits intoexvim:masterfrom

Commits on Mar 3, 2015

merger from github master
cpiger
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Commits on Oct 12, 2018

Commits on Oct 15, 2018

_cwd
cpiger
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Commits on Jan 31, 2019

add cscope_engine gtags support
cpiger
committed

Commits on Apr 11, 2019

g:ex_project_browser g:ex_gsearch_engine g:ex_cscope_engine
cpiger
committed

Commits on May 31, 2019

comment
cpiger
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