Jawn/sandbox

[jawndiego]

makes changes to program class:

1. specifies that a sigReqAccount set a programModAccount
2. has a checkAuthorization method that queries allowedToModifyProgram storage struct
3. updates constraints -> programs from v0.0.8
4. programs test

makes changes to register:

1. allows address to set a programModAccount in register
2. if no programModAccount then sigReqAccount = programModAccount
3. registration test

make changes to keys/index

1. added different ways to generate from pk, from seed, from seeds, from mnemonic
2. added keys test

index test is passing up until signature where we get socket and chachadecryption errors atm.

[jawndiego]

whoops. all test passing except sign. which is currently facing a chacha decryption error and socket error