Cuesubmit command feedback

[KernAttila]

Link the Issue(s) this Pull Request is related to.
#1277
#1279

Summarize your change.

• Add a command feedback line, printing out the final command that will be sent to cuebot for any jobType.
• It uses a new function greyOut() that makes the lineEdit read-only
• The functions used to build commands have a new silent argument to avoid raising errors (only used by the UI)
• Fixed redundant code to build command according to each job type
• The FRAME_TOKEN constant should not be overridable as it is not forwarded to the java command replacing the tokens
• Fixed the Maya command to use #FRAME_START# and #FRAME_END# tokens instead of #IFRAME#

Screenshots

[KernAttila]

The expected Maya command was not updated in the Submission_tests.py
It now pass the test successfully

[DiegoTavares]

This branch unfortunately got caught in conflicts. @KernAttila would you be willing to fix the conflicts and push another commit. I'll review and merge right away

[KernAttila]

This branch unfortunately got caught in conflicts. @KernAttila would you be willing to fix the conflicts and push another commit. I'll review and merge right away

Hi @DiegoTavares,

Sure thing, I changed studio this year and will get back to OpenCue soon.
Happy to see things moving, I'll get back on other PRs as well :)