[RFC] Backports for v0.8.5

[kimikage]

To be backported

• [x] NotBiggerThanInt64, nbitsint, showtype (#189)
• [x] #205
• [x] #208
• [x] widen1(T::Type), tests (#207)
• [x] #206
  • Needs #278
• [x] (partial) #214
• [x] #212
• [x] #218
• [x] (partial) #213
• [x] (partial) #220
• [x] #223
  • Needs #291
• [x] (partial) #224
• [x] tests (#222)
• [x] (partial) #226
• [x] #229
• [x] #231
• [x] move trunc (#235)
• [x] #238
• [x] #233
• [x] QuoteNode,return nothing, tests(#243)
• [x] #244
• [x] #248
• [x] #253
• [x] #254
• [x] #257
• [x] #263
• [x] #270
• [x] #276
• [x] #279
• [x] #280
• [x] #277
• [x] #278
• [x] #283
• [x] #286
• [x] #290
• [x] #289
• [x] #291
• [x] #295

Not to be backported

PR	Reason / Note
#189	💥Breaking (partially backported✅)
#207	💥Breaking (partially backported✅)
#190	Too many changes
#216	💥Breaking
#217	Dependent on #190
#222	💥Breaking (partially backported✅)
#225	Replaced by #283
#230	Dependent on #190
#235	💥Breaking (partially backported✅)
#236	💥Breaking
#243	💥Breaking (partially backported✅)
#249	Reverted
#258	💥for v0.9
#255	Reverted
#262	Not needed
#267	Not needed
#266	Not needed
#265	Not needed
#269	Not needed
#273	Not needed
#275	Not needed
#281	Not needed
#259	Not needed
#284	Not needed
#282	Not needed
#287	Not needed

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.35065% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 96.98%. Comparing base (cab78d7) to head (295b8d1).

Files	Patch %	Lines
src/utilities.jl	88.88%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-0.8 #293 +/- ## =============================================== + Coverage 89.80% 96.98% +7.17% =============================================== Files 6 7 +1 Lines 461 630 +169 =============================================== + Hits 414 611 +197 + Misses 47 19 -28 ```

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[kimikage]

I am going to give this up.