* added `sc_spirv_to_glsl` API function for debugging spirv shaders / spirv cross

* small adjustments to test

* `Rc`: call operator is forwarded correctly
* `glsl`: initial work on separate sampler types

* `glsl`: locations, bindings and sets for uniforms, buffers and varying parameters can be of a type that implicitly casts to `i32`

* `Capture`: fixed invalid implicit conversion of template not producing a cast error

* SPIR-V: fixed unstructured branch validation error for `if/elseif/else` construct
* retired `value-kind-if` node in favor of `value-kind-cond-template`
* removed `sc_if_*` API functions
* added `sc_cond_new` API function

* SPIR-V: fixed `test_spirv_loop` and structured selection errors in validator

* SPIR-V: fixed wrong decorations for matrix types in structs

* fixed mismatched swizzle constants for vector sizes < 4

Re: [PATCH] added support for hashing integers more than 64-bit wide

added support for hashing integers more than 64-bit wide

* fixed inplace operators failing on properties

* fixed dot notation accidentally matching infix notation

* upgraded `mod` to perform floor division as well

* implemented `mod` operator to perform euclidean division

* implemented `distance` in core

* glm: matrix constructor now returns constants when all arguments are constant
* `extractvalue`, `insertvalue`, `extractelement` and `insertelement` return constants when all arguments are constant

* glm: if all vector construction arguments are constant, the vector will be constant

* pointers can be explicitly cast to intptr and back

* removed surprising behavior from tuple constructor