Inkscape build toolset v0.60

Most notable changes in this release are

• use project jhb for bootstrapping
• reusable workflows
• dependency updates

build info

• workflow run release #66
• sha256 is fca84c050afec7d59ac8eb44128aa1cd64c56b2a3093b74e3f99bcdcaaa5d0dc
• important parameters

  SYS_MACOS_VER = 10.15.7
  SYS_SDK_VER = 10.13
  VERSION = 0.60
  VER_DIR = /Users/Shared/work/mibap-0.60
  WRK_DIR = /Users/Shared/work