feat(PNG): Add initial PNG support

CHANGELOG.md

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+# Image-View Changelog
+
+## v0.1.x - **The PNG Update**
+
+Incremental support for PNG image types is being added
+
+### v0.1.7
+
+* Extract chunk validation to macro
+  * Instead of validating the chunk type (and data) manually, the `PNG_VALIDATE(chunkType, defaultReturn)` macro should be used
+
+### v0.1.6
+
+* Added support for remaining miscellaneous chunk types
+  * `bKGD` chunks can be processed through the `png_bKGD_*()` functions
+  * `hIST` chunks can be processed through the `png_hIST_*()` functions
+  * `sPLT` chunks can be processed through the `png_sPLT_*()` functions
+
+### v0.1.5a
+
+* Refactor functions to more accurately represent chunk order, as defined in the International Standard
+
+### v0.1.5
+
+* Added support for color space information chunks:
+  * `cHRM` chunks can be processed through the `png_cHRM_*()` functions
+  * `gAMA` chunks can be processed through the `png_gAMA*()` functions
+  * `iCCP` chunks can be processed through the `png_iCCP_*()` functions
+  * `sBIT` chunks can be processed through the `png_sBIT_*()` functions
+  * `sRGB` chunks can be processed through the `png_sRGB_get()` function
+
+### v0.1.4
+
+* Added support for transparency ancillary chunks:
+  * `tRNS` chunks can be processed through the `png_tRNS_*()` functions
+
+### v0.1.3
+
+* Added command-line option for a deep scan:
+  * A normal scan (options `-s` or `--scan`) only reveal the chunks and their length
+  * A deep scan reveals information pertinent to each chunk (first 10 palette entries, textual/date information, etc.)
+
+### v0.1.2
+
+* Added support for remaining critical chunks:
+  * `PLTE` chunks can be processed through the `png_PLTE_*()` functions
+  * `IDAT` chunks can be processed through the `png_IDAT_*()` functions
+  * `IEND` chunks can be validated with the `png_IEND_valid()` function
+
+### v0.1.1
+
+* Added extraction for other image attributes:
+  * Bit depth with `png_attr_bit_depth()`
+  * Color type with `png_attr_col_type()`
+  * Compression method with `png_attr_comp_method()`
+  * Filter method with `png_attr_filter_method()`
+  * Interlace method with `png_attr_il_method()`
+* Added ability to quickly extract timestamp from `tIME` chunks in ISO 8601 format with `png_tIME_iso8601()`
+* Added support for two new chunks:
+  1. `pHYs` chunks are supported through `png_pHYs_*()` functions
+  2. `zTXt` chunks are supported through `png_zTXt_*()` functions
+* Other various improvements were made:
+  * Memory management was cleaned up
+  * Logging was enhanced and messaging was removed, to be implemented elsewhere
+
+### v0.1.0
+
+* Scan through PNG chunks with `png_open()`, `png_chunk_next()`; online documentation coming soon
+* Some textual metadata supported:
+  1. `tEXt` chunks are supported through `png_tEXt_*()` functions
+  2. `iTXt` chunks are partially supported for keyword, language and text fields through `png_iTXt_*()` functions
+  3. `tIME` chunks are supported for extracting each timestamp attribute through `png_tIME_*()` functions
+* Easy attribute extraction for image width and height: `png_attr_w()` and `png_attr_h()`, respectively
+
+## v0.0.0
+
+* No features have been implemented yet