Allow for clap to parse argument values into types

This changes

- `.flag`, `.option`, `.options` and `.positionals` are now just fields
  you access on the result of `parse` and `parseEx`.
- `clap.ComptimeClap` has been removed.
- `clap.StreamingClap` is now called `clap.streaming.Clap`
- `parse` and `parseEx` now takes a `value_parsers` argument that
  provides the parsers to parse values.
- Remove `helpEx`, `helpFull`, `usageEx` and `usageFull`. They now just
  expect `Id` to have methods for getting the description and value
  texts.

1 files changed, 17 insertions, 34 deletions

diff --git a/example/README.md.template b/example/README.md.template
index 7f5c545..9fbc1cc 100644
--- a/example/README.md.template
+++ b/example/README.md.template
@@ -27,33 +27,24 @@ The simplest way to use this library is to just call the `clap.parse` function.
 {s}
 ```
 
-The data structure returned has lookup speed on par with array access (`arr[i]`) and validates
-that the strings you pass to `option`, `options` and `flag` are actually parameters that the
-program can take:
+The result will contain an `args` field and a `positionals` field. `args` will have one field
+for each none positional parameter of your program. The name of the field will be the longest
+name of the parameter.
+
+The fields in `args` are typed. The type is based on the name of the value the parameter takes.
+Since `--number` takes a `usize` the field `res.args.number` has the type `usize`.
+
+Note that this is only the case because `clap.parsers.default` has a field called `usize` which
+contains a parser that returns `usize`. You can pass in something other than `clap.parsers.default`
+if you want some other mapping.
 
 ```zig
 {s}
 ```
 
-```
-zig-clap/clap/comptime.zig:109:17: error: --helps is not a parameter.
-                @compileError(name ++ " is not a parameter.");
-                ^
-zig-clap/clap/comptime.zig:77:45: note: called from here
-            const param = comptime findParam(name);
-                                            ^
-zig-clap/clap.zig:238:31: note: called from here
-            return a.clap.flag(name);
-                              ^
-zig-clap/example/simple-error.zig:16:18: note: called from here
-    _ = args.flag("--helps");
-```
-
-There is also a `parseEx` variant that takes an argument iterator.
+### `streaming.Clap`
 
-### `StreamingClap`
-
-The `StreamingClap` is the base of all the other parsers. It's a streaming parser that uses an
+The `streaming.Clap` is the base of all the other parsers. It's a streaming parser that uses an
 `args.Iterator` to provide it with arguments lazily.
 
 ```zig
@@ -65,8 +56,9 @@ is generated at runtime.
 
 ### `help`
 
-The `help`, `helpEx` and `helpFull` are functions for printing a simple list of all parameters the
-program can take.
+The `help` prints a simple list of all parameters the program can take. It expects the
+`Id` to have a `description` method and an `value` method so that it can provide that
+in the output.
 
 ```zig
 {s}
@@ -78,19 +70,10 @@ $ zig-out/bin/help --help
         -v, --version   Output version information and exit.
 ```
 
-The `help` functions are the simplest to call. It only takes an `OutStream` and a slice of
-`Param(Help)`.
-
-The `helpEx` is the generic version of `help`. It can print a help message for any
-`Param` give that the caller provides functions for getting the help and value strings.
-
-The `helpFull` is even more generic, allowing the functions that get the help and value strings
-to return errors and take a context as a parameter.
-
 ### `usage`
 
-The `usage`, `usageEx` and `usageFull` are functions for printing a small abbreviated version
-of the help message.
+The `usage` prints a small abbreviated version of the help message. It expects the `Id`
+to have a `value` method so it can provide that in the output.
 
 ```zig
 {s}