Support for files with whitespace not comma as delimiter (#70)

* Inital support for files with whitespace not comma as delimiter

* Ignore raw files

* Automatically detect the delimiter

* Add tests for space delimited files and quoted zero bus numbers

* Bump version

* Add `delim` keyword to docs homepage

* Update docs/src/index.md

* Add ignoring of repeated delimiters to `next_line`

Author: nickrobinson251

.gitignore

@@ -4,3 +4,6 @@
 .DS_Store
 /Manifest.toml
 /docs/build/
+
+/*.raw
+/*.RAW

Project.toml

@@ -1,7 +1,7 @@
 name = "PowerFlowData"
 uuid = "dd99e9e3-7471-40fc-b48d-a10501125371"
 authors = "Nick Robinson <npr251@gmail.com> and contributors"
-version = "1.3.1"
+version = "1.4.0"
 
 [deps]
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"