loaders 0.0.0

# Spinners

A spinner is a progress bar without a length. You can use `ProgressBar::new_spinner()` or
the `Spinner` wrapper when you prefer spinner-specific method names.

## Presets

`loaders` ships with 27 built-in loading frame presets:

| Name | Frames |
|---|---|
| `dots` | braille dot cycle |
| `dots2` | heavy braille dot cycle |
| `dots3` | smooth braille dot cycle |
| `line` | `- \ | /` |
| `pipe` | box pipe cycle |
| `star` | star pulse |
| `bounce` | minimal bounce |
| `arrows` | directional arrows |
| `clock` | clock faces |
| `earth` | globe rotation |
| `moon` | moon phases |
| `runner` | walking/running frames |
| `pong` | moving paddle frames |
| `shark` | swimming text frames |
| `weather` | weather icons |
| `christmas` | tree frames |
| `toggle` | filled/empty square |
| `square_corners` | rotating square corners |
| `binary` | `0 1 10 11` |
| `meter` | `▱▱▱ ▰▱▱ ▰▰▱ ▰▰▰` |
| `quadrants` | `◐ ◓ ◑ ◒` |
| `triangles` | `◢ ◣ ◤ ◥` |
| `circle` | `○ ◔ ◐ ◕ ●` |
| `box_bounce` | moving block |
| `pulse` | `. .. ... ..` |
| `heart` | `♡ ♥` |
| `progress_blocks` | `▁ ▂ ▃ ▄ ▅ ▆ ▇ █` |

## Custom Frames

```rust
use loaders::{ProgressBar, ProgressStyle};

let pb = ProgressBar::new_spinner();
pb.set_style(ProgressStyle::default_spinner().tick_strings(&[".", "o", "O", "o"]));
pb.tick();
```

## Success and Failure Symbols

```rust
use loaders::{Spinner, spinner::frames::DOTS};

let spinner = Spinner::with_message(&DOTS, "uploading");
spinner.stop_with_symbol("ok", "uploaded");
```

Convenience helpers provide portable text markers:

```rust
use loaders::{Spinner, spinner::frames::METER};

let spinner = Spinner::with_message(&METER, "checking");
spinner.success("ready");
```

Use `failure`, `warning`, and `info` for the other common terminal outcomes.

## Custom Message and Padding

Spinners use the same template engine as progress bars, so message fields can be padded
or truncated with width specs such as `{msg:>20}` and `{prefix:^10}`.

## Tick Intervals

Fast terminal spinners usually feel good at 60-120ms. Longer operations with expensive
rendered templates can use 120-250ms. Background ticking is optional; manual `tick()` is
better when each loop iteration naturally represents progress.