Clean and update dependencies

* Remove tweak feature
 * Remove const-tweaker
 * Update tiny_http
 * Update bitvec to 0.21.0
 * Downgrade euc to avoid conflict with vek 0.12.0
 * Require exactly vek 0.12.0
 * Update all other dependencies automatically based on these changes
 * Update gilrs to latest at the request of Ada Lovegirls
 * Update meshing benchmarks to new criterion API

server-cli/Cargo.toml

@@ -9,7 +9,6 @@ worldgen = ["server/worldgen"]
 default = ["worldgen"]
 tracy = ["common/tracy", "tracing-tracy"]
 plugins = ["server/plugins"]
-tweak = ["server/tweak"]
 
 [dependencies]
 server = { package = "veloren-server", path = "../server", default-features = false }