Lazy Merge support; documentation and optimisations

What's Changed

• Grammar and clarity fixes by @cadenza-git in #9
• readme corrections by @gvelim in #10
• Optimise in-place Merge for adjacent arrays to 0.5 O(n) memory penalty by @gvelim in #11
• Shallow merge & superimposing of ordered references by @gvelim in #12
• virtual slice refactoring by @gvelim in #17
• Flatten / Denormalise workflow logic for _merge() by @gvelim in #19

New Contributors

• @cadenza-git made their first contribution in #9

Full Changelog: v1.1...MG_v2.0