Update foresee sample config to 13.6 TeV and add ability to sample hists in 1 or 2D

Two changes:

• Updated foresee config to ECoM = 13.6 TeV
• Allow sampling energy with 1D hist or energy vs theta with 2D hist via 1D: --sampler hist --hist_name filename.root:histname 2D: --sampler hist2D --hist_name filename.root:histname --angle None

Hi @torrence, Please take a look at the second part of this and merge if you are happy with how I implemented it.

merged

mentioned in commit 17f71940