Update .jvmopts

Instead of create project/scripts/sbt.bat, we update .jvmopts.
-J-X options are not supported on windows:

sbt/sbt#5179

Author: liufengyun

.jvmopts

@@ -1,4 +1,6 @@
 -Xss1m
 -Xms512m
--Xmx1200m
+-Xmx4096m
 -XX:MaxInlineLevel=35
+-XX:ReservedCodeCacheSize=512m
+-XX:MaxMetaspaceSize=1024m

project/scripts/sbt

@@ -10,7 +10,6 @@ CMD="${1:?Missing sbt command}"
 sbt -J-Xmx4096m \
     -J-XX:ReservedCodeCacheSize=512m \
     -J-XX:MaxMetaspaceSize=1024m \
-    -Ddotty.drone.mem=4096m \
     -DSBT_PGP_USE_GPG=false \
     -no-colors \
     "$CMD"