v0.6.0

Changes since 0.6.0-rc2

• Readme updated
• Documentation link updated (from inside icestudio)

Changes since 0.5.0

• Submodule edition
• Clone blocks
• Generic blocks
• Optimizations
• Toolchain update: Nextpnr. ECP5 Family
• Initial Plugin system
• Dark Theme support
• iceRok Plugin: Measure your circuits!
• Support for new boards: ULX3S, EDU-CIAA-FPGA, Alchitry Cu, Fomu, Icesugar
• Ice-build folder
• Verilog generation improved
• Initial Collection manager menu