Extend floating-point support within the ARMv7 model.

The model can be configured for VFPv2, VFPv3 or VFPv4.

Most VFP instructions are modelled now but some are still missing, i.e.:

• VCVT for fixed-point and half-precision.
• VSTM and VLDM.

Add assembly code entry points for some decompiler tools.

Add assembly code parsing/printing support for the M0 and ARMv7 models.

There are new entry points to the decompiler. These take a function that maps a quotation (containing machine or assembly code) into a list of strings (typically hex). This facilitate the input of ARM assembly code. For example, the functions:

m0_decompLib.m0_decompile_code
m0_core_decompLib.m0_core_decompile_code
arm_decompLib.arm_decompile_code
arm_core_decompLib.arm_core_decompile_code

are provided with type

: string -> string quotation -> Thm.thm * Thm.thm

Updates for machine-code tools.

Added support for introducing SEP_ARRAY predicates for memory operations (applied to the ARM and M0 models).

The ARM-M0 model is now hooked up to the "core/fast" decompiler.

Make the building of SPEC theorems more lazy (when using arm_progLib.arm_spec_hex).

Various updates/improvements to the decompiler tools.

Reorganisation and improvements for the "fast" decompiler.

Now tentatively called the "core" decompiler.