Delegates session update to the session object.

[lopezca]

PR for issue #1500

• Delegates touchSession code to WASession and enables specialization if desired.

[codecov]

Codecov Report

❌ Patch coverage is 90.43011% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.27%. Comparing base (a4c8bad) to head (1014fa0).
⚠️ Report is 58 commits behind head on master.

Files with missing lines	Patch %	Lines
...scriptStringEncoder.class/class/initializeTable.st	0.00%	18 Missing ⚠️
...ngEncoder.class/class/initializeJavascriptTable.st	0.00%	10 Missing ⚠️
...m.extension/instance/javascriptStringEncoderOn..st	0.00%	5 Missing ⚠️
...SJavascriptCanvas.class/instance/scaledDecimal..st	0.00%	5 Missing ⚠️
...StringEncoder.class/class/maximumCharacterValue.st	0.00%	5 Missing ⚠️
...t-Core.package/JSObject.class/instance/printOn..st	0.00%	5 Missing ⚠️
...mallDictionary.extension/instance/javascriptOn..st	0.00%	4 Missing ⚠️
...ackage/JSJavascriptBrush.class/class/isAbstract.st	0.00%	4 Missing ⚠️
...avascriptCanvas.class/instance/writeIfNotFirst..st	0.00%	4 Missing ⚠️
...JSJavascriptElementBrush.class/class/isAbstract.st	0.00%	4 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1515      +/-   ##
==========================================
+ Coverage   52.08%   52.27%   +0.18%     
==========================================
  Files        9225     9351     +126     
  Lines       77226    77762     +536     
==========================================
+ Hits        40226    40651     +425     
- Misses      37000    37111     +111     

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