[FEATURE] - improve masking in templates (variables i1, i2)

[DemonGlasses]

Ready-made templates for the i1 and i2 variables are used for masking. Currently, these are static values ​​that are the same for all users. These templates are easy to find using DPI and can be quickly blocked. Please improve masking in the templates (i1 and i2 variables) use:

<r N> for N random bytes
<rc N> for random letters [a-zA-Z]
<rd N> for N random digits [0-9]

[alexandervlpl]

Need to be sure that doesn't break the validity of the desired protocol (QUIC, SIP, etc).