Feature/#37 delimiters configuration

[b3b00]

This pull request allows to configure starting an ending tag delimiters (default "{%" and "%}" accordingly)
2 arguments have been added to the qtc compiler :

• "sTag" for the starting tag delimiter : -sTag '{%'
• "eTag" for the starting tag delimiter : -sTag '%}'

Delimiters mus respect following rules :

• each delimiter must be exactly 2 characters long
• starting delimiter's last char and ending delimiter's first char must be identical, eg
  • '[-' and '-]' are OK
  • '[-' and '%]' are not allowed
• each delimiter cannot consist of the same char repitition, eg
  • '{%' is OK
  • '{{' is KO

These rules are for compatibility reasons with original templates parsing.

[b3b00]

tested successfully with the basic server example :

• '[%' and '%]'
• '[-' and '-]'

[b3b00]

Hello @valyala , did you consider my pull-request ? I am aware that the implementation is not perfect.

[valyala]

@b3b00 , what is the use case for custom delimiters?

Custom delimiters may fragment and complicate the experience with quicktemplate templates, since these delimiters must be supported by external tools such as IDEs and syntax highlighters.

[b3b00]

This PR answers issue #37 .
It 's up to you to decide whether or not it's a good idea.