Dfferent color for up and down reflines

[deepakchethan]

Fixes #1328

TODO

• UTF support

After change:

[lgtm-com]

This pull request introduces 1 alert when merging 36a1aec into 3e3d97b - view on LGTM.com

new alerts:

• 1 for Returning stack-allocated memory

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Comment posted by LGTM.com

[radare]

.

[lgtm-com]

This pull request introduces 1 alert when merging 7b4946c1cc27c8cd704e4ab4b23e4a2bbc66340b into 680340c - view on LGTM.com

new alerts:

• 1 for Returning stack-allocated memory

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Comment posted by LGTM.com

[deepakchethan]

I fixed the returning stack-allocated memory issue as well

Most of the fails in the Travis are due to the fact that previously empty strings were also placed between color and reset.
The current implementation ignores colors for spaces/ empty strings.
Should I update the tests?

[radare]

Yes, please update the tests. lgtm

[radare]

.

[codecov-io]

Codecov Report

Merging #14134 into master will increase coverage by <.01%.
The diff coverage is 86.27%.

@@            Coverage Diff             @@
##           master   #14134      +/-   ##
==========================================
+ Coverage    37.8%   37.81%   +<.01%     
==========================================
  Files         949      949              
  Lines      305172   305236      +64     
==========================================
+ Hits       115367   115419      +52     
- Misses     189805   189817      +12

Impacted Files	Coverage Δ
libr/core/disasm.c	74.92% <82.6%> (+0.05%)	⬆️
libr/anal/reflines.c	65.82% <93.93%> (+1.48%)	⬆️
libr/util/str.c	60.9% <0%> (-0.05%)	⬇️

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