Simplify, cleanup mesh conversion infrastructure

Will continue for 1706 as well

Leave as temporary tag to note addition, removal of mesh conversions etc.

mentioned in commit ffffe41acd9d338e03cc0d8a92ab5f21826aebdc

mentioned in commit 45b6acc2389a498a7691a417a7ac94ee36bbe8f3

mentioned in commit be99e74a4ba67ead2a000b426b78499b950bb4ca

Mentioned in commit 1d57cfec

Mentioned in commit 2dbe05dc

Mentioned in commit b6f7bac8

Mentioned in commit 7c6ef0cb

Mentioned in commit 22ffcb461ab72d7fb26339f11030e33abe412cf7

Mentioned in commit 4eaf57ceb27cf517e67b4f8e6be2c3bfa0b9eda1

Mentioned in commit 307b1071b9558fa9e483a45860810e8063d1b59d

Mentioned in merge request !76 (merged)

Mentioned in commit 0e1b60be

Mentioned in commit 0c47c583

Mentioned in commit 492938d3

Mentioned in commit 692451ae

Milestone changed to %Version v1706

closed