v0.8.0 options, skill table, KGE and more

Last release before major rewrite of back-end and release 1.0 which is expected in Q2.

What's Changed

• added skill table if requested by @daniel-caichac-DHI in #133
• Default style by @daniel-caichac-DHI in #136
• Added metric Kling Gupta Efficiency by @ecomodeller in #138
• added units flag scatter by @daniel-caichac-DHI in #134
• Define metrics in a single place by @ecomodeller in #139
• Histogram default to density=True by @ecomodeller in #143
• Alternative implementation of the scatter index by @jsmariegaard in #142
• Added missing case in unit display by @daniel-caichac-DHI in #145
• Added Skill Table if N_obs>1 by @daniel-caichac-DHI in #151
• Dataarray by @ecomodeller in #141
• Update to python version by @ecomodeller in #153
• Update vision.md by @ecomodeller in #156
• package-wide options by @jsmariegaard in #158
• return AX in scatter by @daniel-caichac-DHI in #162
• Mood Style by @daniel-caichac-DHI in #160
• max_gap_fix by @daniel-caichac-DHI in #148
• Fix warnings by @ecomodeller in #152
• Prepare release 0.8 by @jsmariegaard in #167

Full Changelog: v0.7.0...v0.8.0