Deprecates `Pointer::split_at`, adds `Pointer::split_at_offset`

[chanced]

trafficstars

Solves #88

• Deprecates Pointer::split_at
• Adds Pointer::split_at_offset

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.1%. Comparing base (c694765) to head (290d650).

Files with missing lines	Patch %	Lines
src/pointer.rs	50.0%	2 Missing :warning:

Additional details and impacted files

Files with missing lines	Coverage Δ
src/pointer.rs	98.0% <50.0%> (-0.3%)	:arrow_down:

[asmello]

Are we still moving forward with this @chanced?