Fix some todo comments

[bilal-alsharifi]

Fixes #1306
This PR is ready for review.

Risk

This PR makes no API changes.

Summary

This PR fixes some todo comments in the library

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1503 into develop will increase coverage by 0.67%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1503      +/-   ##
=============================================
+ Coverage      55.76%   56.43%   +0.67%     
- Complexity      4957     5098     +141     
=============================================
  Files            515      515              
  Lines          21982    22509     +527     
  Branches        2737     2904     +167     
=============================================
+ Hits           12258    12703     +445     
- Misses          8815     8853      +38     
- Partials         909      953      +44     

Impacted Files	Coverage Δ	Complexity Δ
...va/com/smartdevicelink/session/BaseSdlSession.java	26.40% <ø> (ø)	13.00 <0.00> (ø)
...tdevicelink/managers/screen/BaseScreenManager.java	67.75% <0.00%> (-0.56%)	71.00% <0.00%> (+23.00%)	⬇️
...icelink/managers/screen/TextsAndGraphicsState.java	100.00% <0.00%> (ø)	24.00% <0.00%> (ø%)
...va/com/smartdevicelink/protocol/BaseSdlPacket.java	72.00% <0.00%> (+2.40%)	27.00% <0.00%> (+2.00%)
...anagers/lifecycle/BaseSystemCapabilityManager.java	71.08% <0.00%> (+4.29%)	66.00% <0.00%> (+12.00%)
...ink/managers/screen/BaseTextAndGraphicManager.java	68.23% <0.00%> (+5.49%)	74.00% <0.00%> (+28.00%)
...managers/screen/TextAndGraphicUpdateOperation.java	79.00% <0.00%> (+6.15%)	164.00% <0.00%> (+75.00%)
...in/java/com/smartdevicelink/proxy/RPCResponse.java	61.29% <0.00%> (+6.45%)	11.00% <0.00%> (+1.00%)