Create memory block interface

[achakravarti]

https://stackoverflow.com/questions/1898153/

lsr_mblock_new();
lsr_mblock_new_align();
lsr_mblock_copy();
lsr_mblock_retain();
lsr_mblock_release();
lsr_mblock_dispose();
lsr_mblock_cmp();
lsr_mblock_lt();
lsr_mblock_eq();
lsr_mlbock_gt();
lsr_mblock_sz();
lsr_mblock_refc();
lsr_mblock_alignment();
lsr_mblock_resize();
lsr_mblock_str();