v3.4.0-p0: Hunterize OpenEXR

Hunterize OpenEXR

• add HunterGate v0.11.0
• add Hunter v0.26.4
• add Imath as dependency
• add libdeflate as depencency, introduced in v3.2.0
• no zlib dependency since v3.2.0, replaced by libdeflate
• add OpenJPH as dependency, since v3.4.0

---

internal_ht.cpp: fix OpenJPH includes for 0.23

OpenJPH 0.23.0 unified the include directories between cmake and
pkgconfig. Need to update the correpsonding includes to contain the
`openjph/` subfolder.

Corresponding PR:
https://github.com/AcademySoftwareFoundation/openexr/pull/2122