ucm: add integer comparison condition (Syntax 9)

ucm: add integer comparison condition (Syntax 9)

Adds support for integer comparison operations in If.Condition blocks.
Supports operators: ==, !=, <, >, <=, >= for comparing integer values.
Both values are substituted and converted from strings to 64-bit integers.
Hexadecimal (C like) strings are also accepted (like 0x1234).

Example usage:
  If.check_channels {
    Condition {
      Type Integer
      Operation ">"
      Value1 "${var:channels}"
      Value2 "2"
    }
    True { ... }
  }

Signed-off-by: Jaroslav Kysela <perex@perex.cz>