First release with CFG verification

In this release the following features are added:

• support for verification of CFGs generated by the decompiler and CFG generator
• stronger post-conditions in abstract semantics to verify CFGs
• update to Dafny 4.9.0 for verification
• benchmarks: verified CFGs for the test suite less_than_300_opcodes from the project EVMLisa

V0.1.0-beta

• add formal verification of CFGs
• fix minor typos in documentation.

v0.0.0-alpha

This release provides the following features:

• build control flow graph for EVM bytecode
• generates a proof that the CFG is correct in the form of a Dafny program.