The bug caused secondary keys to not be updated in the DB by modify()
when the associated secondary index table row iterator was not already
in the cache because db_idx_find_primary overwrote the to-be-updated
value with the old value from the DB.

Rename action_size to action_data_size.

Underflow/overflow checks assumes invariants satisfied for input asset
instances (specifically that their amounts are within the allowed
range).

Constructor checks if provided amount is within the allowed interval
(-2^62, 2^62).

After deserializing asset (or extended_asset), user needs to check if
valid using `is_valid()` which also checks if amount is in allowed
range.

Consider native system contracts privileged if the system account is, the generalization of authority bypass in `execute_inline` exposed this bug
Add Boost include to the paths for abi_tests, asset.hpp now includes serialize.hpp which is depends on boost includes
Add missing headers to asset.hpp, there were a few headers missing that made asset.hpp something you could not stand-alone include
Adjust API tests to reflect the ABI level change of `printi(U64)` to `printi(I64)`

This reverts commit 53350a47.

Tests fail: `call_indirect to function with wrong signature`