Add support to analyse and-or-! connected equations

[S3v3ru5]

Fixes issues #90, #95

It is common to use logical operators to validate multiple fields at a time. examples include:

txn RekeyTo
global ZeroAddress
==
txn CloseRemainderTo
global ZeroAddress
==
&&
txn AssetCloseTo
global ZeroAddress
&&
assert

txn OnCompletion
int UpdateApplication
==
txn OnCompletion
int DeleteApplication
==
||
!                                  // txn is not UpdateApplication or DeleteApplication.
assert

More complex patterns could be used to perform transaction field validations. This PR adds support to infer information about interested fields when the comparison equations are combined using logical operators &&, ||, and !.

[S3v3ru5]

Builds on #131