added mutable text object to storm

[invisig0th]

No description provided.

[codecov]

Codecov Report

Merging #1258 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1258      +/-   ##
==========================================
+ Coverage   94.13%   94.16%   +0.03%     
==========================================
  Files         126      126              
  Lines       16443    16457      +14     
==========================================
+ Hits        15478    15497      +19     
+ Misses        965      960       -5

Impacted Files	Coverage Δ
synapse/lib/stormtypes.py	96.08% <100%> (+0.28%)	⬆️
synapse/lib/ast.py	94.68% <100%> (+0.09%)	⬆️
synapse/lib/storm.py	92.85% <0%> (-0.21%)	⬇️
synapse/lib/link.py	96.42% <0%> (+4.46%)	⬆️

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