Issue list search

[claytonrcarter]

Adds search feature to lab issue list. (See #208) Also aliases list to search, as in lab project list.

lab issue list                        # no change; list all open issues
lab issue list "search terms"         # search issues for "search terms"
lab issue search "search terms"       # ditto
lab issue list remote "search terms"  # search "remote" for issues with "search terms"

Also, hope its OK I took the liberty to rename the parseArgs* functions to make them a little more clear.

[codecov]

Codecov Report

Merging #242 into master will increase coverage by 0.2%.
The diff coverage is 77.14%.

@@            Coverage Diff            @@
##           master     #242     +/-   ##
=========================================
+ Coverage   68.11%   68.32%   +0.2%     
=========================================
  Files          41       42      +1     
  Lines        2158     2251     +93     
=========================================
+ Hits         1470     1538     +68     
- Misses        541      554     +13     
- Partials      147      159     +12

Impacted Files	Coverage Δ
cmd/issue_list.go	93.93% <100%> (+1.08%)	⬆️
cmd/root.go	72.93% <70.37%> (-0.66%)	⬇️
internal/git/edit.go	76.62% <0%> (-2.79%)	⬇️
cmd/issue_note.go	79.54% <0%> (ø)
internal/gitlab/gitlab.go	42.47% <0%> (+0.16%)	⬆️

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[zaquestion]

Opps! these comments never got submitted my bad!!