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Assembly Memory Safety

This PR does a once-over on memory Safety for the 1.5.0 contracts. In
particular, there were a couple of missing `memory-safe` tags for some
assembly blocks which were preventing the IR assembler from working
correctly.

Additionally, since the `MultiSend*` contracts changed anyway in 1.5.0,
I took this opportunity to change the assembly to be memory-safe so that
we can tag it. Note that it only adds more code in the revert case, so
it should not have a negative impact for most use-cases.

Furthermore, I added a comment explaining why we did not make the
`SafeProxy` contract memory-safe (that is one intentional).

Lastly, I noticed that there were some `eq(..., 0)` assembly calls which
can be written as `iszero(...)` to save some gas and code.

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