feat(templates): Expose row flags for menu, page, crumbs

[Ibochkarev]

What

pdoMenu, pdoPage, and pdoCrumbs put boolean placeholders on each template row so one chunk can replace a stack of specialized tpl* files.

Values are 1 or 0 for Fenom {if $isActive} and MODX [[+isActive]].

Shared: isFirst, isLast, isActive. Menu also: hasChildren / hasChilds, isHere, isStart, isCategory, isInner. Page also: isSkip. Crumbs also: isHome.

Existing tplHere, tplParentRowActive, tplPageActive, tplCurrent, and the rest still win when set. Flags are always present either way.

Menu example:

<li {$classes}>
{if $isFirst}
    <i class="fas fa-home"></i>
{else}
    {if $isActive}
        <span>{$menutitle}</span>
    {else}
        <a class="nav__link" href="{$id|url}">{$menutitle}</a>
    {/if}
    {if $hasChilds}{$wrapper}{/if}
{/if}
</li>

Why

Without these flags you need separate chunks for current, parent, first, empty first/last page, and so on. The state was already computed for CSS classes and tpl selection; it was not exposed to the template.

Fixes #11

[codecov]

Codecov Report

❌ Patch coverage is 81.04575% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.66%. Comparing base (2ab402d) to head (9c73f19).

Files with missing lines	Patch %	Lines
core/components/pdotools/src/Support/Paginator.php	50.00%	17 Missing ⚠️
.../components/pdotools/src/Support/MenuItemState.php	86.58%	11 Missing ⚠️
.../components/pdotools/src/Support/PageItemState.php	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #29      +/-   ##
============================================
+ Coverage     20.74%   26.66%   +5.91%     
+ Complexity     1171     1165       -6     
============================================
  Files            15       18       +3     
  Lines          2964     3011      +47     
============================================
+ Hits            615      803     +188     
+ Misses         2349     2208     -141     

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