Allow deref syntax in formtag lifts, allow formatstring/dollarexpr in varderef (SYN-4495, SYN-4470)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.11 ⚠️

Comparison is base (7274108) 97.26% compared to head (ba1d297) 97.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3065      +/-   ##
==========================================
- Coverage   97.26%   97.15%   -0.11%     
==========================================
  Files         222      222              
  Lines       43899    43899              
==========================================
- Hits        42697    42652      -45     
- Misses       1202     1247      +45     

Flag	Coverage Δ
linux	97.15% <ø> (ø)
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/parser.py	98.72% <ø> (ø)

... and 9 files with indirect coverage changes

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