v0.7.0

What's Changed

• add SDHOST driver, so the card and Wi-Fi can run at once by @joeferner in #86
• Deglom by @joeferner in #87
• drop to SVC when launching a secondary core on AArch32 by @joeferner in #88
• wifi: report what the link is doing, and whether the radio may sleep by @joeferner in #89
• enable the instruction cache on ARMv7-A by @joeferner in #90
• wifi: ask the firmware whether the chip is associated by @joeferner in #91
• say what the fault was, instead of parking silently by @joeferner in #92
• Stack guard by @joeferner in #93
• say where free memory starts and stops by @joeferner in #94
• choose a display, and work out its real size by @joeferner in #95
• don't carry the stack guard's helper into a build that cannot use it by @joeferner in #96
• empty the RNG FIFO before promising a warmup by @joeferner in #98
• release 0.7.0 by @joeferner in #99

Full Changelog: v0.6.0...v0.7.0