Update IDG version to 1.1.0.

Tag the current state of the repository as version 1.1.0.

Bugfixes:

• CUDA gridder: large number of channels
• CUDA gridder: few timesteps per subgrid
• CUDA degridder: Stokes-I submode
• CUDA gridder + degridder: out-of-bounds reads
• Plan: visibility count and jobsize
• CPU W-Tiling: forward/backward FFT swapped
• Add workaround for CUDA profiler errors

New features:

• Add optional phasor extrapolation feature for CUDA kernels
• Add Python CUDA kernel tests

Miscellaneous:

• Use current versions of Everybeam, DP3 and WSClean in CI
• Fix idg-cal for current DP3/Everybeam
• Remove schaap-stack from CI
• Move to new servers for documentation and CI data
• Update SKA CI to use k8srunner-gpu runner
• Remove deprecated OpenCL code
• Restore support for Maxwell GPU architecture
• Various cleanup and improvements to CUDA kernels